############################################################################## # Copyright (c) 2016 NEC Corporation and others. # # All rights reserved. This program and the accompanying materials # are made available under the terms of the Apache License, Version 2.0 # which accompanies this distribution, and is available at # http://www.apache.org/licenses/LICENSE-2.0 ############################################################################## import argparse import json import requests import socket import time # NOTE: icmp message with all zero data (checksum = 0xf7ff) # see https://tools.ietf.org/html/rfc792 ICMP_ECHO_MESSAGE = '\x08\x00\xf7\xff\x00\x00\x00\x00' class DoctorMonitorSample(object): interval = 0.1 # second timeout = 0.1 # second event_type = "compute.host.down" def __init__(self, args): self.hostname = args.hostname self.inspector = args.inspector self.ip_addr = socket.gethostbyname(self.hostname) def start_loop(self): print "start ping to host %s" % self.hostname sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP) sock.settimeout(self.timeout) while True: try: sock.sendto(ICMP_ECHO_MESSAGE, (self.ip_addr, 0)) data = sock.recv(4096) except socket.timeout: print "doctor monitor detected at %s" % time.time() self.report_error() print "ping timeout, quit monitoring..." return time.sleep(self.interval) def report_error(self): payload = {"type": self.event_type, "hostname": self.hostname} data = json.dumps(payload) headers = {'content-type': 'application/json'} requests.post(self.inspector, data=data, headers=headers) def get_args(): parser = argparse.ArgumentParser(description='Doctor Sample Monitor') parser.add_argument('hostname', metavar='HOSTNAME', type=str, nargs='?', help='a hostname to monitor connectivity') parser.add_argument('inspector', metavar='INSPECTOR', type=str, nargs='?', help='inspector url to report error', default='http://127.0.0.1:12345/events') return parser.parse_args() def main(): args = get_args() monitor = DoctorMonitorSample(args) monitor.start_loop() if __name__ == '__main__': main()